Taxanes having a carbonate substituent at C(7), a hydroxy substituent at C(10), and a range of C(2), C(9), C(14), and side chain substituents....http://www.google.com/patents/US7226944?utm_source=gb-gplus-sharePatent US7226944 - Taxanes having a C7 carbonate substituent

15. A method of preparing a pharmaceutical composition comprising mixing at least one nonaqueous, pharmaceutically acceptable solvent and a taxane of claim 1.

16. A composition for inhibiting tumor growth comprising a taxane of claim 1 and a pharmaceutically acceptable carrier.

17. The taxane of claim 5 wherein R7a is is methyl, ethyl or propyl.

Description

REFERENCE TO RELATED APPLICATION

This application is a continuation of application Ser. No. 10/743,581 filed Dec. 22, 2003 now U.S. Pat. No. 6,992,104 which is a continuation based on Ser. No. 09/776,137 filed Feb. 2, 2001 now U.S. Pat. No. 6,780,879 which claims priority from U.S. provisional application Ser. No. 60/179,671, filed on Feb. 2, 2000.

BACKGROUND OF THE INVENTION

The present invention is directed to novel taxanes which have exceptional utility as antitumor agents.

The taxane family of terpenes, of which baccatin III and taxol are members, has been the subject of considerable interest in both the biological and chemical arts. Taxol itself is employed as a cancer chemotherapeutic agent and possesses a broad range of tumor-inhibiting activity. Taxol has a 2′R, 3′S configuration and the following structural formula:

wherein Ac is acetyl.

Colin et al. reported in U.S. Pat. No. 4,814,470 that certain taxol analogs have an activity significantly greater than that of taxol. One of these analogs, commonly referred to as docetaxel, has the following structural formula:

Although taxol and docetaxel are useful chemotherapeutic agents, there are limitations on their effectiveness, including limited efficacy against certain types of cancers and toxicity to subjects when administered at various doses. Accordingly, a need remains for additional chemotherapeutic agents with improved efficacy and less toxicity.

SUMMARY OF THE INVENTION

Among the objects of the present invention, therefore, is the provision of taxanes which compare favorably to taxol and docetaxel with respect to efficacy as anti-tumor agents and with respect to toxicity. In general, these taxanes possess a carbonate substituent at C-7, a hydroxy substituent at C-10, and a range of C(2), C(9), C(14), and C(13) side chain substituents.

Briefly, therefore, the present invention is directed to the taxane composition, per se, to pharmaceutical compositions comprising the taxane and a pharmaceutically acceptable carrier, and to methods of administration.

Other objects and features of this invention will be in part apparent and in part pointed out hereinafter.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In one embodiment of the present invention, the taxanes of the present invention correspond to structure (1):

R7, R9, and R10 independently have the alpha or beta stereochemical configuration.

In one embodiment, R2 is an ester (R2aC(O)O—), a carbamate (R2aR2bNC(O)O—), a carbonate (R2aOC(O)O—), or a thiocarbonate (R2aSC(O)O—) wherein R2a and R2b are independently hydrogen, hydrocarbyl, substituted hydrocarbyl or heterocyclo. In a preferred embodiment, R2 is an ester (R2aC(O)O—), wherein R2a is aryl or heteroaromatic. In another preferred embodiment, R2 is an ester (R2aC(O)O—), wherein R2a is substituted or unsubstituted phenyl, furyl, thienyl, or pyridyl. In one particularly preferred embodiment, R2 is benzoyloxy.

While R9 is keto in one embodiment of the present invention, in other embodiments R9 may have the alpha or beta stereochemical configuration, preferably the beta stereochemical configuration, and may be, for example, α- or β-hydroxy or α- or β-acyloxy. For example, when R9 is acyloxy, it may be an ester (R9aC(O)O—), a carbamate (R9aR9bNC(O)O—), a carbonate (R9aOC(O)O—), or a thiocarbonate (R9aSC(O)O—) wherein R9a and R9b are independently hydrogen, hydrocarbyl, substituted hydrocarbyl or heterocyclo. If R9 is an ester (R9aC(O)O—), R9a is substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aryl or substituted or unsubstituted heteroaromatic. Still more preferably, R9 is an ester (R9aC(O)O—), wherein R9a is substituted or unsubstituted phenyl, substituted or unsubstituted furyl, substituted or unsubstituted thienyl, or substituted or unsubstituted pyridyl. In one embodiment R9 is (R9aC(O)O—) wherein R9a is methyl, ethyl, propyl (straight, branched or cyclic), butyl (straight, branched or cyclic), pentyl, (straight, branched or cyclic), or hexyl (straight, branched or cyclic). In another embodiment R9 is (R9aC(O)O—) wherein R9a is substituted methyl, substituted ethyl, substituted propyl (straight, branched or cyclic), substituted butyl (straight, branched or cyclic), substituted pentyl, (straight, branched or cyclic), or substituted hexyl (straight, branched or cyclic) wherein the substituent(s) is/are selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.

X10 is hydrocarbyl, substituted hydrocarbyl, or heterocyclo. For example, in this preferred embodiment in which the taxane corresponds to structure (2), R7 may be R7aOCOO— wherein R7a is substituted or unsubstituted methyl, ethyl, propyl, butyl, pentyl or hexyl, more preferably substituted or unsubstituted methyl, ethyl or propyl, still more preferably substituted or unsubstituted methyl, ethyl, and still more preferably unsubstituted methyl or ethyl. While R7a is selected from among these, in one embodiment X3 is selected from substituted or unsubstituted alkyl, alkenyl, phenyl or heterocyclo, more preferably substituted or unsubstituted alkenyl, phenyl or heterocyclo, still more preferably substituted or unsubstituted phenyl or heterocyclo, and still more preferably heterocyclo such as furyl, thienyl or pyridyl. While R7a and X3 are selected from among these, in one embodiment X5 is selected from —COX10 wherein X10 is phenyl, alkyl or heterocyclo, more preferably phenyl. Alternatively, while R7a and X3 are selected from among these, in one embodiment X5 is selected from —COX10 wherein X10 is phenyl, alkyl or heterocyclo, more preferably phenyl, or X5 is —COOX10 wherein X10 is alkyl, preferably t-butyl. Among the more preferred embodiments, therefore, are taxanes corresponding to structure 2 in which (i) X5 is —COOX10 wherein X10 is tert-butyl or X5 is —COX10 wherein X10 is phenyl, (ii) X3 is substituted or unsubstituted cycloalkyl, alkenyl, phenyl or heterocyclo, more preferably substituted or unsubstituted isobutenyl, phenyl, furyl, thienyl, or pyridyl, still more preferably unsubstituted isobutenyl, furyl, thienyl or pyridyl, and (iii) R7a is unsubstituted methyl, ethyl or propyl, more preferably methyl or ethyl.

Among the preferred embodiments, therefore, are taxanes corresponding to structure 1 or 2 wherein R7 is R7aOCOO— wherein R7a is methyl. In this embodiment, X3 is preferably cycloalkyl, isobutenyl, phenyl, substituted phenyl such as p-nitrophenyl, or heterocyclo, more preferably heterocyclo, still more preferably furyl, thienyl or pyridyl; and X5 is preferably benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl. In one alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is hydroxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is hydroxy and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydrido. In each of the alternatives of this embodiment when the taxane has structure 1, R7 and R10 may each have the beta stereochemical configuration, R7 and R10 may each have the alpha stereochemical configuration, R7 may have the alpha stereochemical configuration while R10 has the beta stereochemical configuration or R7 may have the beta stereochemical configuration while R10 has the alpha stereochemical configuration.

Also among the preferred embodiments are taxanes corresponding to structure 1 or 2 wherein R7 is R7aOCOO— wherein R7a is ethyl. In this embodiment, X3 is preferably cycloalkyl, isobutenyl, phenyl, substituted phenyl such as p-nitrophenyl, or heterocyclo, more preferably heterocyclo, still more preferably furyl, thienyl or pyridyl; and X5 is preferably benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl. In one alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is hydroxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is hydroxy and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydrido. In each of the alternatives of this embodiment when the taxane has structure 1, R7 and R10 may each have the beta stereochemical configuration, R7 and R10 may each have the alpha stereochemical configuration, R7 may have the alpha stereochemical configuration while R10 has the beta stereochemical configuration or R7 may have the beta stereochemical configuration while R10 has the alpha stereochemical configuration.

Also among the preferred embodiments are taxanes corresponding to structure 1 or 2 wherein R7 is R7aOCOO— wherein R7a is propyl. In this embodiment, X3 is preferably cycloalkyl, isobutenyl, phenyl, substituted phenyl such as p-nitrophenyl, or heterocyclo, more preferably heterocyclo, still more preferably furyl, thienyl or pyridyl; and X5 is preferably benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl. In one alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is keto and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is hydroxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is hydroxy and R14 is hydrido. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydroxy. In another alternative of this embodiment, X3 is heterocyclo; X5 is benzoyl, alkoxycarbonyl, or heterocyclocarbonyl, more preferably benzoyl, t-butoxycarbonyl or t-amyloxycarbonyl, still more preferably t-butoxycarbonyl; R2 is benzoyl, R9 is acyloxy and R14 is hydrido. In each of the alternatives of this embodiment when the taxane has structure 1, R7 and R10 may each have the beta stereochemical configuration, R7 and R10 may each have the alpha stereochemical configuration, R7 may have the alpha stereochemical configuration while R10 has the beta stereochemical configuration or R7 may have the beta stereochemical configuration while R10 has the alpha stereochemical configuration.

Taxanes having the general formula 1 may be obtained by treatment of a β-lactam with an alkoxide having the taxane tetracyclic nucleus and a C-13 metallic oxide substituent to form compounds having a β-amido ester substituent at C-13 (as described more fully in Holton U.S. Pat. No. 5,466,834), followed by removal of the hydroxy protecting groups. The β-lactam has the following structural formula (3):

wherein P2 is a hydroxy protecting group and X3 and X5 are as previously defined and the alkoxide has the structural formula (4):

wherein M is a metal or ammonium, P10 is a hydroxy protecting group and R2, R9, R7 and R14 are as previously defined.

Alkoxide 4 may be prepared from 10-deacetylbaccatin III (or a derivative thereof) by selective protection of the C-10 hydroxyl group and then acylation of the C-7 hydroxyl group followed by treatment with a metallic amide. In one embodiment of the present invention, the C(10) hydroxyl group of 10-deacetylbaccatin III is selectively protected with a silyl group using, for example, a silylamide or bissilyamide as a silylating agent. Preferred silylating agents include tri(hydrocarbyl)silyl-trifluoromethylacetamides and bis tri(hydrocarbyl)-silyltrifluoromethylacetamides (with the hydrocarbyl moiety being substituted or unsubstituted alkyl or aryl) such as N,O-bis-(trimethylsilyl) trifluoroacetamide, N,O-bis-(triethylsilyl)trifluoroacetamide, N-methyl-N-triethylsilyltrifluoroacetamide, and N,O-bis(t-butyldimethylsilyl)trifluoroacetamide. The silylating agents may be used either alone or in combination with a catalytic amount of a base such as an alkali metal base. Alkali metal amides, such as lithium amide catalysts, in general, and lithium hexamethyldisilazide, in particular, are preferred. The solvent for the selective silylation reaction is preferably an ethereal solvent such as tetrahydrofuran. Alternatively, however, other solvents such as ether or dimethoxyethane may be used. The temperature at which the C(10) selective silylation is carried out is not narrowly critical. In general, however, it is carried out at 0° C. or greater.

Selective acylation of the C(7) hydroxyl group of a C(10) protected taxane to form a C(7) carbonate can be achieved using any of a variety of common acylating agents such as a haloformates. In general, acylation of the C(7) hydroxy group of a C(10) protected taxane are more efficient and more selective than are C(7) acylations of a 7,10-dihydroxy taxane such as 10-DAB; stated another way, once the C(10) hydroxyl group has been protected, there is a significant difference in the reactivity of the remaining C(7), C(13), and C(1) hydroxyl groups. These acylation reactions may optionally be carried out in the presence or absence of an amine base.

Derivatives of 10-deacetylbaccatin III having alternative substituents at C(2), C(9) and C(14) and processes for their preparation are known in the art. Taxane derivatives having acyloxy substituents other than benzoyloxy at C(2) may be prepared, for example, as described in Holton et al., U.S. Pat. No. 5,728,725 or Kingston et al., U.S. Pat. No. 6,002,023. Taxanes having acyloxy or hydroxy substituents at C(9) in place of keto may be prepared, for example as described in Holton et al., U.S. Pat. No. 6,011,056 or Gunawardana et al., U.S. Pat. No. 5,352,806. Taxanes having a beta hydroxy substituent at C(14) may be prepared from naturally occurring 14-hydroxy-10-deacetylbaccatin III.

Processes for the preparation and resolution of the β-lactam starting material are generally well known. For example, the β-lactam may be prepared as described in Holton, U.S. Pat. No. 5,430,160 and the resulting enatiomeric mixtures of β-lactams may be resolved by a stereoselective hydrolysis using a lipase or enzyme as described, for example, in Patel, U.S. Pat. No. 5,879,929 Patel U.S. Pat. No. 5,567,614 or a liver homogenate as described, for example, in PCT Patent Application No. 00/41204. In a preferred embodiment in which the β-lactam is furyl substituted at the C(4) position, the β-lactam can be prepared as illustrated in the following reaction scheme:

wherein Ac is acetyl, NEt3 is triethylamine, CAN is ceric ammonium nitrate, and p-TsOH is p-toluenesulfonic acid. The beef liver resolution may be carried out, for example, by combining the enatiomeric β-lactam mixture with a beef liver suspension (prepared, for example, by adding 20 g of frozen beef liver to a blender and then adding a pH 8 buffer to make a total volume of 1 L).

Compounds of formula 1 of the instant invention are useful for inhibiting tumor growth in mammals including humans and are preferably administered in the form of a pharmaceutical composition comprising an effective antitumor amount of a compound of the instant invention in combination with at least one pharmaceutically or pharmacologically acceptable carrier. The carrier, also known in the art as an excipient, vehicle, auxiliary, adjuvant, or diluent, is any substance which is pharmaceutically inert, confers a suitable consistency or form to the composition, and does not diminish the therapeutic efficacy of the antitumor compounds. The carrier is “pharmaceutically or pharmacologically acceptable” if it does not produce an adverse, allergic or other untoward reaction when administered to a mammal or human, as appropriate.

The pharmaceutical compositions containing the antitumor compounds of the present invention may be formulated in any conventional manner. Proper formulation is dependent upon the route of administration chosen. The compositions of the invention can be formulated for any route of administration so long as the target tissue is available via that route. Suitable routes of administration include, but are not limited to, oral, parenteral (e.g., intravenous, intraarterial, subcutaneous, rectal, subcutaneous, intramuscular, intraorbital, intracapsular, intraspinal, intraperitoneal, or intrasternal), topical (nasal, transdermal, intraocular), intravesical, intrathecal, enteral, pulmonary, intralymphatic, intracavital, vaginal, transurethral, intradermal, aural, intramammary, buccal, orthotopic, intratracheal, intralesional, percutaneous, endoscopical, transmucosal, sublingual and intestinal administration.

Pharmaceutically acceptable carriers for use in the compositions of the present invention are well known to those of ordinary skill in the art and are selected based upon a number of factors: the particular antitumor compound used, and its concentration, stability and intended bioavailability; the disease, disorder or condition being treated with the composition; the subject, its age, size and general condition; and the route of administration. Suitable carriers are readily determined by one of ordinary skill in the art (see, for example, J. G. Nairn, in: Remington's Pharmaceutical Science (A. Gennaro, ed.), Mack Publishing Co., Easton, Pa., (1985), pp. 1492-1517, the contents of which are incorporated herein by reference).

The antitumor compounds of the present invention are also preferably formulated for parenteral administration, e.g., formulated for injection via intravenous, intraarterial, subcutaneous, rectal, subcutaneous, intramuscular, intraorbital, intracapsular, intraspinal, intraperitoneal, or intrasternal routes. The compositions of the invention for parenteral administration comprise an effective antitumor amount of the antitumor compound in a pharmaceutically acceptable carrier. Dosage forms suitable for parenteral administration include solutions, suspensions, dispersions, emulsions or any other dosage form which can be administered parenterally. Techniques and compositions for making parenteral dosage forms are known in the art.

Additional minor components can be included in the compositions of the invention for a variety of purposes well known in the pharmaceutical industry. These components will for the most part impart properties which enhance retention of the antitumor compound at the site of administration, protect the stability of the composition, control the pH, facilitate processing of the antitumor compound into pharmaceutical formulations, and the like. Preferably, each of these components is individually present in less than about 15 weight % of the total composition, more preferably less than about 5 weight %, and most preferably less than about 0.5 weight % of the total composition. Some components, such as fillers or diluents, can constitute up to 90 wt. % of the total composition, as is well known in the formulation art. Such additives include cryoprotective agents for preventing reprecipitation of the taxane, surface active, wetting or emulsifying agents (e.g., lecithin, polysorbate-80, TweenŽ 80, pluronic 60, polyoxyethylene stearate), preservatives (e.g., ethyl-p-hydroxybenzoate), microbial preservatives (e.g., benzyl alcohol, phenol, m-cresol, chlorobutanol, sorbic acid, thimerosal and paraben), agents for adjusting pH or buffering agents (e.g., acids, bases, sodium acetate, sorbitan monolaurate), agents for adjusting osmolarity (e.g., glycerin), thickeners (e.g., aluminum monostearate, stearic acid, cetyl alcohol, stearyl alcohol, guar gum, methyl cellulose, hydroxypropylcellulose, tristearin, cetyl wax esters, polyethylene glycol), colorants, dyes, flow aids, non-volatile silicones (e.g., cyclomethicone), clays (e.g., bentonites), adhesives, bulking agents, flavorings, sweeteners, adsorbents, fillers (e.g., sugars such as lactose, sucrose, mannitol, or sorbitol, cellulose, or calcium phosphate), diluents (e.g., water, saline, electrolyte solutions), binders (e.g., starches such as maize starch, wheat starch, rice starch, or potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropyl methylcellulose, sodium carboxymethyl cellulose, polyvinylpyrrolidone, sugars, polymers, acacia), disintegrating agents (e.g., starches such as maize starch, wheat starch, rice starch, potato starch, or carboxymethyl starch, cross-linked polyvinyl pyrrolidone, agar, alginic acid or a salt thereof such as sodium alginate, croscarmellose sodium or crospovidone), lubricants (e.g., silica, talc, stearic acid or salts thereof such as magnesium stearate, or polyethylene glycol), coating agents (e.g., concentrated sugar solutions including gum arabic, talc, polyvinyl pyrrolidone, carbopol gel, polyethylene glycol, or titanium dioxide), and antioxidants (e.g., sodium metabisulfite, sodium bisulfite, sodium sulfite, dextrose, phenols, and thiophenols).

In a preferred embodiment, a pharmaceutical composition of the invention comprises at least one nonaqueous, pharmaceutically acceptable solvent and an antitumor compound having a solubility in ethanol of at least about 100, 200, 300, 400, 500, 600, 700 or 800 mg/ml. While not being bound to a particular theory, it is believed that the ethanol solubility of the antitumor compound may be directly related to its efficacy. The antitumor compound can also be capable of being crystallized from a solution. In other words, a crystalline antitumor compound, such as compound 1393, can be dissolved in a solvent to form a solution and then recrystallized upon evaporation of the solvent without the formation of any amorphous antitumor compound. It is also preferred that the antitumor compound have an ID50 value (i.e, the drug concentration producing 50% inhibition of colony formation) of at least 4, 5, 6, 7, 8, 9, or 10 times less that of paclitaxel when measured according to the protocol set forth in the working examples.

Dosage form administration by these routes may be continuous or intermittent, depending, for example, upon the patient's physiological condition, whether the purpose of the administration is therapeutic or prophylactic, and other factors known to and assessable by a skilled practitioner.

Dosage and regimens for the administration of the pharmaceutical compositions of the invention can be readily determined by those with ordinary skill in treating cancer. It is understood that the dosage of the antitumor compounds will be dependent upon the age, sex, health, and weight of the recipient, kind of concurrent treatment, if any, frequency of treatment, and the nature of the effect desired. For any mode of administration, the actual amount of antitumor compound delivered, as well as the dosing schedule necessary to achieve the advantageous effects described herein, will also depend, in part, on such factors as the bioavailability of the antitumor compound, the disorder being treated, the desired therapeutic dose, and other factors that will be apparent to those of skill in the art. The dose administered to an animal, particularly a human, in the context of the present invention should be sufficient to effect the desired therapeutic response in the animal over a reasonable period of time. Preferably, an effective amount of the antitumor compound, whether administered orally or by another route, is any amount which would result in a desired therapeutic response when administered by that route. Preferably, the compositions for oral administration are prepared in such a way that a single dose in one or more oral preparations contains at least 20 mg of the antitumor compound per m2 of patient body surface area, or at least 50, 100, 150, 200, 300, 400, or 500 mg of the antitumor compound per m2 of patient body surface area, wherein the average body surface area for a human is 1.8 m2. Preferably, a single dose of a composition for oral administration contains from about 20 to about 600 mg of the antitumor compound per m2 of patient body surface area, more preferably from about 25 to about 400 mg/m2, even more preferably, from about 40 to about 300 mg/m2, and even more preferably from about 50 to about 200 mg/m2. Preferably, the compositions for parenteral administration are prepared in such a way that a single dose contains at least 20 mg of the antitumor compound per m2 of patient body surface area, or at least 40, 50, 100, 150, 200, 300, 400, or 500 mg of the antitumor compound per m2 of patient body surface area. Preferably, a single dose in one or more parenteral preparations contains from about 20 to about 500 mg of the antitumor compound per m2 of patient body surface area, more preferably from about 40 to about 400 mg/m2, and even more preferably, from about 60 to about 350 mg/m2. However, the dosage may vary depending on the dosing schedule which can be adjusted as necessary to achieve the desired therapeutic effect. It should be noted that the ranges of effective doses provided herein are not intended to limit the invention and represent preferred dose ranges. The most preferred dosage will be tailored to the individual subject, as is understood and determinable by one of ordinary skill in the art without undue experimentation.

The concentration of the antitumor compound in a liquid pharmaceutical composition is preferably between about 0.01 mg and about 10 mg per ml of the composition, more preferably between about 0.1 mg and about 7 mg per ml, even more preferably between about 0.5 mg and about 5 mg per ml, and most preferably between about 1.5 mg and about 4 mg per ml. Relatively low concentrations are generally preferred because the antitumor compound is most soluble in the solution at low concentrations. The concentration of the antitumor compound in a solid pharmaceutical composition for oral administration is preferably between about 5 weight % and about 50 weight %, based on the total weight of the composition, more preferably between about 8 weight % and about 40 weight %, and most preferably between about 10 weight % and about 30 weight %.

In one embodiment, solutions for oral administration are prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution. An appropriate volume of a carrier which is a solution, such as CremophorŽ EL solution, is added to the solution while stirring to form a pharmaceutically acceptable solution for oral administration to a patient. If desired, such solutions can be formulated to contain a minimal amount of, or to be free of, ethanol, which is known in the art to cause adverse physiological effects when administered at certain concentrations in oral formulations.

In another embodiment, powders or tablets for oral administration are prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution. The solvent can optionally be capable of evaporating when the solution is dried under vacuum. An additional carrier can be added to the solution prior to drying, such as CremophorŽ EL solution. The resulting solution is dried under vacuum to form a glass. The glass is then mixed with a binder to form a powder. The powder can be mixed with fillers or other conventional tabletting agents and processed to form a tablet for oral administration to a patient. The powder can also be added to any liquid carrier as described above to form a solution, emulsion, suspension or the like for oral administration.

Emulsions for parenteral administration can be prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution. An appropriate volume of a carrier which is an emulsion, such as LiposynŽ II or LiposynŽ III emulsion, is added to the solution while stirring to form a pharmaceutically acceptable emulsion for parenteral administration to a patient. If desired, such emulsions can be formulated to contain a minimal amount of, or to be free of, ethanol or CremophorŽ solution, which are known in the art to cause adverse physiological effects when administered at certain concentrations in parenteral formulations.

Solutions for parenteral administration can be prepared by dissolving an antitumor compound in any pharmaceutically acceptable solvent capable of dissolving the compound (e.g., ethanol or methylene chloride) to form a solution. An appropriate volume of a carrier which is a solution, such as CremophorŽ solution, is added to the solution while stirring to form a pharmaceutically acceptable solution for parenteral administration to a patient. If desired, such solutions can be formulated to contain a minimal amount of, or to be free of, ethanol or CremophorŽ solution, which are known in the art to cause adverse physiological effects when administered at certain concentrations in parenteral formulations.

If desired, the emulsions or solutions described above for oral or parenteral administration can be packaged in IV bags, vials or other conventional containers in concentrated form and diluted with any pharmaceutically acceptable liquid, such as saline, to form an acceptable taxane concentration prior to use as is known in the art.

Definitions

The terms “hydrocarbon” and “hydrocarbyl” as used herein describe organic compounds or radicals consisting exclusively of the elements carbon and hydrogen. These moieties include alkyl, alkenyl, alkynyl, and aryl moieties. These moieties also include alkyl, alkenyl, alkynyl, and aryl moieties substituted with other aliphatic or cyclic hydrocarbon groups, such as alkaryl, alkenaryl and alkynaryl. Unless otherwise indicated, these moieties preferably comprise 1 to 20 carbon atoms.

The “substituted hydrocarbyl” moieties described herein are hydrocarbyl moieties which are substituted with at least one atom other than carbon, including moieties in which a carbon chain atom is substituted with a hetero atom such as nitrogen, oxygen, silicon, phosphorous, boron, sulfur, or a halogen atom. These substituents include halogen, heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyl, acyloxy, nitro, amino, amido, nitro, cyano, thiol, ketals, acetals, esters and ethers.

Unless otherwise indicated, the alkyl groups described herein are preferably lower alkyl containing from one to eight carbon atoms in the principal chain and up to 20 carbon atoms. They may be straight or branched chain or cyclic and include methyl, ethyl, propyl, isopropyl, butyl, hexyl and the like.

Unless otherwise indicated, the alkenyl groups described herein are preferably lower alkenyl containing from two to eight carbon atoms in the principal chain and up to 20 carbon atoms. They may be straight or branched chain or cyclic and include ethenyl, propenyl, isopropenyl, butenyl, isobutenyl, hexenyl, and the like.

Unless otherwise indicated, the alkynyl groups described herein are preferably lower alkynyl containing from two to eight carbon atoms in the principal chain and up to 20 carbon atoms. They may be straight or branched chain and include ethynyl, propynyl, butynyl, isobutynyl, hexynyl, and the like.

The terms “aryl” or “ar” as used herein alone or as part of another group denote optionally substituted homocyclic aromatic groups, preferably monocyclic or bicyclic groups containing from 6 to 12 carbons in the ring portion, such as phenyl, biphenyl, naphthyl, substituted phenyl, substituted biphenyl or substituted naphthyl. Phenyl and substituted phenyl are the more preferred aryl.

The terms “halogen” or “halo” as used herein alone or as part of another group refer to chlorine, bromine, fluorine, and iodine.

The terms “heterocyclo” or “heterocyclic” as used herein alone or as part of another group denote optionally substituted, fully saturated or unsaturated, monocyclic or bicyclic, aromatic or nonaromatic groups having at least one heteroatom in at least one ring, and preferably 5 or 6 atoms in each ring. The heterocyclo group preferably has 1 or 2 oxygen atoms, 1 or 2 sulfur atoms, and/or 1 to 4 nitrogen atoms in the ring, and may be bonded to the remainder of the molecule through a carbon or heteroatom. Exemplary heterocyclo include heteroaromatics such as furyl, thienyl, pyridyl, oxazolyl, pyrrolyl, indolyl, quinolinyl, or isoquinolinyl and the like. Exemplary substituents include one or more of the following groups: hydrocarbyl, substituted hydrocarbyl, keto, hydroxy, protected hydroxy, acyl, acyloxy, alkoxy, alkenoxy, alkynoxy, aryloxy, halogen, amido, amino, nitro, cyano, thiol, ketals, acetals, esters and ethers.

The term “heteroaromatic” as used herein alone or as part of another group denote optionally substituted aromatic groups having at least one heteroatom in at least one ring, and preferably 5 or 6 atoms in each ring. The heteroaromatic group preferably has 1 or 2 oxygen atoms, 1 or 2 sulfur atoms, and/or 1 to 4 nitrogen atoms in the ring, and may be bonded to the remainder of the molecule through a carbon or heteroatom. Exemplary heteroaromatics include furyl, thienyl, pyridyl, oxazolyl, pyrrolyl, indolyl, quinolinyl, or isoquinolinyl and the like. Exemplary substituents include one or more of the following groups: hydrocarbyl, substituted hydrocarbyl, keto, hydroxy, protected hydroxy, acyl, acyloxy, alkoxy, alkenoxy, alkynoxy, aryloxy, halogen, amido, amino, nitro, cyano, thiol, ketals, acetals, esters and ethers.

The term “acyl,” as used herein alone or as part of another group, denotes the moiety formed by removal of the hydroxyl group from the group —COOH of an organic carboxylic acid, e.g., RC(O)—, wherein R is R1, R1O—, R1R2N—, or R1S—, R1 is hydrocarbyl, heterosubstituted hydrocarbyl, or heterocyclo, and R2 is hydrogen, hydrocarbyl or substituted hydrocarbyl.

The term “acyloxy,” as used herein alone or as part of another group, denotes an acyl group as described above bonded through an oxygen linkage (—O—), e.g., RC(O)O— wherein R is as defined in connection with the term “acyl.”

Unless otherwise indicated, the carbamoyloxy moieties described herein are derivatives of carbamic acid in which one or both of the amine hydrogens is optionally replaced by a hydrocarbyl, substituted hydrocarbyl or heterocyclo moiety.

The terms “hydroxyl protecting group” and “hydroxy protecting group” as used herein denote a group capable of protecting a free hydroxyl group (“protected hydroxyl”) which, subsequent to the reaction for which protection is employed, may be removed without disturbing the remainder of the molecule. A variety of protecting groups for the hydroxyl group and the synthesis thereof may be found in “Protective Groups in Organic Synthesis” by T. W. Greene, John Wiley and Sons, 1981, or Fieser & Fieser. Exemplary hydroxyl protecting groups include methoxymethyl, 1-ethoxyethyl, benzyloxymethyl, (.beta.-trimethylsilylethoxy)methyl, tetrahydropyranyl, 2,2,2-trichloroethoxycarbonyl, t-butyl(diphenyl)silyl, trialkylsilyl, trichloromethoxycarbonyl and 2,2,2-trichloroethoxymethyl.

2′-O-MOP-3′-desphenyl-3′-(2-thienyl)-10-triethylsilyl-7-methoxycarbonyl taxotere. To a solution of 495 mg (0.690 mmol) of 10-triethylsilyl-10-deacetyl-7-methoxycarbonyl baccatin III in 4 mL of anhydrous THF under a nitrogen atmosphere at −45° C. was added 0.72 mL (0.72 mmol) of a 1 M solution of LiHMDS in THF. After 0.5 h a solution of 278 mg (0.814 mmol) of the b-Lactam in 2 mL of anhydrous THF was added. The mixture was warmed to 0° C., and after 2 h 0.5 mL of saturated aqueous sodium bicarbonate solution was added. The mixture was diluted with 50 ml of ethyl acetate and washed two times with 5 mL of brine. The organic phase was dried over sodium sulfate and concentrated under reduced pressure to give a slightly yellow solid. The solid was recrystallized by dissolving it in 12 mL of a 1:5 mixture of ethyl acetate and hexane at reflux and then cooling to room temperature to give 679 mg (93%) of a white crystalline solid which was used directly in the next reaction.

3′-Desphenyl-3′-(2-thienyl)-7-methoxycarbonyl taxotere. To a solution of 211 mg (0.199 mmol) of 2′-O-MOP-3′-desphenyl-3′-(2-thienyl)-10-triethylsilyl-7-methoxycarbonyl taxotere in 1.7 mL of pyridine and 5.4 mL of acetonitrile at 0° C. was added 0.80 mL (2.0 mmol) of an aqueous solution containing 49% HF. The mixture was warmed to room temperature for 14 h and was then diluted with 20 mL of ethyl acetate and washed three times with 2 mL of saturated aqueous sodium bicarbonate and then with 8 mL of brine. The organic phase was dried over sodium sulfate and concentrated under reduced pressure to give 174 mg (100%) of a white solid. The crude product was crystallized with 2 mL of solvent (CH2Cl2:hexane=1:1.7) to give 168 mg (97%) of white crystals. m.p. 142.5-143° C.; [a]D25−25.1 (c 0.53, CHCl3); Anal. Calcd for C43H53NO16S: C, 59.23; H, 6.13. Found: C, 58.99; H, 6.25. 1H NMR (500 MHz, CDCl3):

Proton

d (ppm)

Pattern

J (Hz)

2

5.69

d

H3(6.5)

o-benzoate

8.12

d

m-benzoate(7.5)

m-benzoate

7.51

t

o-benzoate(7.5), p-benzoate(7.5)

p-benzoate

7.62

t

m-benzoate(7.5)

3

4.01

d

H2(6.5)

4Ac

2.39

s

5

4.93

d

H6a(8.0)

6a

2.53

ddd

H7(7.5), H5(9.5), H6b(15.0)

6b

2.00

ddd

H7(11.0), H5(2.5), H6a(15.0)

7

5.29

dd

H6a(7.5), H6b(11.0)

OMe

3.76

s

10

5.39

s

10-OH

4.06

br s

13

6.23

t

H14a(9.0), H14b(9.0)

14a + 14b

2.34

m

16Me

1.11

s

17Me

1.23

s

18Me

1.93

s

19Me

1.86

s

20a

4.33

d

H20b(8.5)

20b

4.21

d

H20a(8.5)

2′

4.64

br

2′OH

3.43

br

3′

5.51

br

3″

7.10

d

H4″(3.5)

4″

7.01

dd

H5″(5.0), H3″(3.5)

5″

7.28

d

H4″(5.0)

NH

5.34

d

H3′(9.5)

(CH3)3C

1.35

s

EXAMPLE 2

The procedures described in Example 1 were repeated, but other suitably protected β-lactams were substituted for the β-lactam of Example 1 to prepare the series of compounds having structural formula (13) and the combinations of substituents identified in the following table.

(13)

Compound

X5

X3

R7

4144

iPrOCO—

2-thienyl

MeOCOO—

4151

iPrOCO—

2-thienyl

EtOCOO—

4164

ibueCO—

2-thienyl

EtOCOO—

4188

PhCO—

2-thienyl

EtOCOO—

4222

2-FuCO—

2-thienyl

MeOCOO—

4234

tBuOCO—

2-thienyl

EtOCOO—

4244

ibueCO—

2-thienyl

MeOCOO—

4262

tBuOCO—

2-thienyl

MeOCOO—

4304

2-FuCO—

2-thienyl

EtOCOO—

4355

iBuOCO—

2-thienyl

MeOCOO—

4363

iBuOCO—

2-thienyl

EtOCOO—

4411

PhCO—

2-thienyl

MeOCOO—

4424

2-ThCO

2-thienyl

MeOCOO—

4434

tBuOCO—

3-furyl

MeOCOO—

4455

2-ThCO

2-thienyl

EtOCOO—

4474

tBuOCO—

3-thienyl

MeOCOO—

4484

tBuOCO—

isobutenyl

MeOCOO—

4500

tBuOCO—

3-thienyl

EtOCOO—

4515

iBuOCO—

3-thienyl

AcO—

4524

tBuOCO—

isobutenyl

EtOCOO—

4533

tBuOCO—

2-furyl

MeOCOO—

4555

tBuOCO—

cyclopropyl

AcO—

4584

iBuOCO—

3-furyl

MeOCOO—

4566

tBuOCO—

cyclopropyl

MeOCOO—

4575

tBuOCO—

2-furyl

MeOCOO—

4624

iBuOCO—

3-furyl

EtOCOO—

4644

iBuOCO—

isobutenyl

MeOCOO—

4656

iBuOCO—

2-furyl

MeOCOO—

4674

iBuOCO—

3-thienyl

MeOCOO—

4688

iBuOCO—

isobutenyl

EtOCOO—

4696

iBuOCO—

2-furyl

EtOCOO—

4744

tC3H5CO—

2-furyl

MeOCOO—

4766

tC3H5CO—

2-thienyl

MeOCOO—

5466

ibueCO—

2-furyl

BnOCOO—

6151

ibueCO—

2-furyl

EtOCOO—

6246

tAmOCO—

2-furyl

BnOCOO—

5433

tBuOCO—

2-furyl

BnOCOO—

4818

tC3H5CO—

2-furyl

EtOCOO—

6566

tC3H5CO—

2-thienyl

BnOCOO—

4855

tC3H5CO—

2-thienyl

EtOCOO—

4464

tBuOCO—

3-furyl

EtOCOO—

4904

tC3H5CO—

3-furyl

EtOCOO—

4877

tC3H5CO—

3-furyl

MeOCOO—

4979

iBuOCO—

3-thienyl

EtOCOO—

4444

tBuOCO—

3-thienyl

MeOCOO—

4999

tC3H5CO—

3-thienyl

EtOCOO—

4969

tC3H5CO—

3-thienyl

MeOCOO—

5225

iBuOCO—

cpro

EtOCOO—

5211

iBuOCO—

cpro

MeOCOO—

5165

tBuOCO—

cpro

EtOCOO—

EXAMPLE 3

Following the processes described in Example 1 and elsewhere herein, the following specific taxanes having structural formula 14 may be prepared, wherein R7 is as previously defined, including wherein R7 is R7aOCOO— and R7a is (i) substituted or unsubstituted C1 to C8 alkyl (straight, branched or cyclic), such as methyl, ethyl, propyl, butyl, pentyl, or hexyl; (ii) substituted or unsubstituted C2 to C8 alkenyl (straight, branched or cyclic), such as ethenyl, propenyl, butenyl, pentenyl or hexenyl; (iii) substituted or unsubstituted C2 to C8 alkynyl (straight or branched) such as ethynyl, propynyl, butynyl, pentynyl, or hexynyl; (iv) substituted or unsubstituted phenyl; or (v) substituted or unsubstituted heterocyclo such as furyl, thienyl, or pyridyl. The substituents may be hydrocarbyl or any of the heteroatom containing substituents selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.

(14)

X5

X3

R7

tBuOCO—

2-furyl

RaOCOO—

tBuOCO—

3-furyl

RaOCOO—

tBuOCO—

2-thienyl

RaOCOO—

tBuOCO—

3-thienyl

RaOCOO—

tBuOCO—

2-pyridyl

RaOCOO—

tBuOCO—

3-pyridyl

RaOCOO—

tBuOCO—

4-pyridyl

RaOCOO—

tBuOCO—

isobutenyl

RaOCOO—

tBuOCO—

isopropyl

RaOCOO—

tBuOCO—

cyclopropyl

RaOCOO—

tBuOCO—

cyclobutyl

RaOCOO—

tBuOCO—

cyclopentyl

RaOCOO—

tBuOCO—

phenyl

RaOCOO—

benzoyl

2-furyl

RaOCOO—

benzoyl

3-furyl

RaOCOO—

benzoyl

2-thienyl

RaOCOO—

benzoyl

3-thienyl

RaOCOO—

benzoyl

2-pyridyl

RaOCOO—

benzoyl

3-pyridyl

RaOCOO—

benzoyl

4-pyridyl

RaOCOO—

benzoyl

isobutenyl

RaOCOO—

benzoyl

isopropyl

RaOCOO—

benzoyl

cyclopropyl

RaOCOO—

benzoyl

cyclobutyl

RaOCOO—

benzoyl

cyclopentyl

RaOCOO—

benzoyl

phenyl

RaOCOO—

2-FuCO—

2-furyl

RaOCOO—

2-FuCO—

3-furyl

RaOCOO—

2-FuCO—

2-thienyl

RaOCOO—

2-FuCO—

3-thienyl

RaOCOO—

2-FuCO—

2-pyridyl

RaOCOO—

2-FuCO—

3-pyridyl

RaOCOO—

2-FuCO—

4-pyridyl

RaOCOO—

2-FuCO—

isobutenyl

RaOCOO—

2-FuCO—

isopropyl

RaOCOO—

2-FuCO—

cyclopropyl

RaOCOO—

2-FuCO—

cyclobutyl

RaOCOO—

2-FuCO—

cyclopentyl

RaOCOO—

2-FuCO—

phenyl

RaOCOO—

2-ThCO—

2-furyl

RaOCOO—

2-ThCO—

3-furyl

RaOCOO—

2-ThCO—

2-thienyl

RaOCOO—

2-ThCO—

3-thienyl

RaOCOO—

2-ThCO—

2-pyridyl

RaOCOO—

2-ThCO—

3-pyridyl

RaOCOO—

2-ThCO—

4-pyridyl

RaOCOO—

2-ThCO—

isobutenyl

RaOCOO—

2-ThCO—

isopropyl

RaOCOO—

2-ThCO—

cyclopropyl

RaOCOO—

2-ThCO—

cyclobutyl

RaOCOO—

s2-ThCO—

cyclopentyl

RaOCOO—

2-ThCO—

phenyl

RaOCOO—

2-PyCO—

2-furyl

RaOCOO—

2-PyCO—

3-furyl

RaOCOO—

2-PyCO—

2-thienyl

RaOCOO—

2-PyCO—

3-thienyl

RaOCOO—

2-PyCO—

2-pyridyl

RaOCOO—

2-PyCO—

3-pyridyl

RaOCOO—

2-PyCO—

4-pyridyl

RaOCOO—

2-PyCO—

isobutenyl

RaOCOO—

2-PyCO—

isopropyl

RaOCOO—

2-PyCO—

cyclopropyl

RaOCOO—

2-PyCO—

cyclobutyl

RaOCOO—

2-PyCO—

cyclopentyl

RaOCOO—

2-PyCO—

phenyl

RaOCOO—

3-PyCO—

2-furyl

RaOCOO—

3-PyCO—

3-furyl

RaOCOO—

3-PyCO—

2-thienyl

RaOCOO—

3-PyCO—

3-thienyl

RaOCOO—

3-PyCO—

2-pyridyl

RaOCOO—

3-PyCO—

3-pyridyl

RaOCOO—

3-PyCO—

4-pyridyl

RaOCOO—

3-PyCO—

isobutenyl

RaOCOO—

3-PyCO—

isopropyl

RaOCOO—

3-PyCO—

cyclopropyl

RaOCOO—

3-PyCO—

cyclobutyl

RaOCOO—

3-PyCO—

cyclopentyl

RaOCOO—

3-PyCO—

phenyl

RaOCOO—

4-PyCO—

2-furyl

RaOCOO—

4-PyCO—

3-furyl

RaOCOO—

4-PyCO—

2-thienyl

RaOCOO—

4-PyCO—

3-thienyl

RaOCOO—

4-PyCO—

2-pyridyl

RaOCOO—

4-PyCO—

3-pyridyl

RaOCOO—

4-PyCO—

4-pyridyl

RaOCOO—

4-PyCO—

isobutenyl

RaOCOO—

4-PyCO—

isopropyl

RaOCOO—

4-PyCO—

cyclopropyl

RaOCOO—

4-PyCO—

cyclobutyl

RaOCOO—

4-PyCO—

cyclopentyl

RaOCOO—

4-PyCO—

phenyl

RaOCOO—

C4H7CO—

2-furyl

RaOCOO—

C4H7CO—

3-furyl

RaOCOO—

C4H7CO—

2-thienyl

RaOCOO—

C4H7CO—

3-thienyl

RaOCOO—

C4H7CO—

2-pyridyl

RaOCOO—

C4H7CO—

3-pyridyl

RaOCOO—

C4H7CO—

4-pyridyl

RaOCOO—

C4H7CO—

isobutenyl

RaOCOO—

C4H7CO—

isopropyl

RaOCOO—

C4H7CO—

cyclopropyl

RaOCOO—

C4H7CO—

cyclobutyl

RaOCOO—

C4H7CO—

cyclopentyl

RaOCOO—

C4H7CO—

phenyl

RaOCOO—

EtOCO—

2-furyl

RaOCOO—

EtOCO—

3-furyl

RaOCOO—

EtOCO—

2-thienyl

RaOCOO—

EtOCO—

3-thienyl

RaOCOO—

EtOCO—

2-pyridyl

RaOCOO—

EtOCO—

3-pyridyl

RaOCOO—

EtOCO—

4-pyridyl

RaOCOO—

EtOCO—

isobutenyl

RaOCOO—

EtOCO—

isopropyl

RaOCOO—

EtOCO—

cyclopropyl

RaOCOO—

EtOCO—

cyclobutyl

RaOCOO—

EtOCO—

cyclopentyl

RaOCOO—

EtOCO—

phenyl

RaOCOO—

ibueCO—

2-furyl

RaOCOO—

ibueCO—

3-furyl

RaOCOO—

ibueCO—

2-thienyl

RaOCOO—

ibueCO—

3-thienyl

RaOCOO—

ibueCO—

2-pyridyl

RaOCOO—

ibueCO—

3-pyridyl

RaOCOO—

ibueCO—

4-pyridyl

RaOCOO—

ibueCO—

isobutenyl

RaOCOO—

ibueCO—

isopropyl

RaOCOO—

ibueCO—

cyclopropyl

RaOCOO—

ibueCO—

cyclobutyl

RaOCOO—

ibueCO—

cyclopentyl

RaOCOO—

ibueCO—

phenyl

RaOCOO—

iBuCO—

2-furyl

RaOCOO—

iBuCO—

3-furyl

RaOCOO—

IBuCO—

2-thienyl

RaOCOO—

iBuCO—

3-thienyl

RaOCOO—

iBuCO—

2-pyridyl

RaOCOO—

iBuCO—

3-pyridyl

RaOCOO—

iBuCO—

4-pyridyl

RaOCOO—

iBuCO—

isobutenyl

RaOCOO—

iBuCO—

isopropyl

RaOCOO—

iBuCO—

cyclopropyl

RaOCOO—

iBuCO—

cyclobutyl

RaOCOO—

iBuCO—

cyclopentyl

RaOCOO—

iBuCO—

phenyl

RaOCOO—

iBuOCO—

2-furyl

RaOCOO—

iBuOCO—

3-furyl

RaOCOO—

iBuOCO—

2-thienyl

RaOCOO—

iBuOCO—

3-thienyl

RaOCOO—

iBuOCO—

2-pyridyl

RaOCOO—

iBuOCO—

3-pyridyl

RaOCOO—

iBuOCO—

4-pyridyl

RaOCOO—

iBuOCO—

isobutenyl

RaOCOO—

iBuOCO—

isopropyl

RaOCOO—

iBuOCO—

cyclopropyl

RaOCOO—

iBuOCO—

cyclobutyl

RaOCOO—

iBuOCO—

cyclopentyl

RaOCOO—

iBuOCO—

phenyl

RaOCOO—

iPrOCO—

2-furyl

RaOCOO—

iPrOCO—

3-furyl

RaOCOO—

iPrOCO—

2-thienyl

RaOCOO—

iPrOCO—

3-thienyl

RaOCOO—

iPrOCO—

2-pyridyl

RaOCOO—

iPrOCO—

3-pyridyl

RaOCOO—

iPrOCO—

4-pyridyl

RaOCOO—

iPrOCO—

isobutenyl

RaOCOO—

IPrOCO—

isopropyl

RaOCOO—

iPrOCO—

cyclopropyl

RaOCOO—

iPrOCO—

cyclobutyl

RaOCOO—

iPrOCO—

cyclopentyl

RaOCOO—

iPrOCO—

phenyl

RaOCOO—

nPrOCO—

2-furyl

RaOCOO—

nPrOCO—

3-furyl

RaOCOO—

nPrOCO—

2-thienyl

RaOCOO—

nPrOCO—

3-thienyl

RaOCOO—

nPrOCO—

2-pyridyl

RaOCOO—

nPrOCO—

3-pyridyl

RaOCOO—

nPrOCO—

4-pyridyl

RaOCOO—

nPrOCO—

isobutenyl

RaOCOO—

nPrOCO—

isopropyl

RaOCOO—

nPrOCO—

cyclopropyl

RaOCOO—

nPrOCO—

cyclobutyl

RaOCOO—

nPrOCO—

cyclopentyl

RaOCOO—

nPrOCO—

phenyl

RaOCOO—

nPrCO—

2-furyl

RaOCOO—

nPrCO—

3-furyl

RaOCOO—

nPrCO—

2-thienyl

RaOCOO—

nPrCO—

3-thienyl

RaOCOO—

nPrCO—

2-pyridyl

RaOCOO—

nPrCO—

3-pyridyl

RaOCOO—

nPrCO—

4-pyridyl

RaOCOO—

nPrCO—

isobutenyl

RaOCOO—

nPrCO—

isopropyl

RaOCOO—

nPrCO—

cyclopropyl

RaOCOO—

nPrCO—

cyclobutyl

RaOCOO—

nPrCO—

cyclopentyl

RaOCOO—

nPrCO—

phenyl

RaOCOO—

tBuOCO—

2-furyl

EtOCOO—

tBuOCO—

2-pyridyl

EtOCOO—

tBuOCO—

3-pyridyl

EtOCOO—

tBuOCO—

4-pyridyl

EtOCOO—

tBuOCO—

isopropyl

EtOCOO—

tBuOCO—

cyclopropyl

EtOCOO—

tBuOCO—

cyclobutyl

EtOCOO—

tBuOCO—

cyclopentyl

EtOCOO—

tBuOCO—

phenyl

EtOCOO—

benzoyl

2-furyl

EtOCOO—

benzoyl

3-furyl

EtOCOO—

benzoyl

3-thienyl

EtOCOO—

benzoyl

2-pyridyl

EtOCOO—

benzoyl

3-pyridyl

EtOCOO—

benzoyl

4-pyridyl

EtOCOO—

benzoyl

isobutenyl

EtOCOO—

benzoyl

isopropyl

EtOCOO—

benzoyl

cyclopropyl

EtOCOO—

benzoyl

cyclobutyl

EtOCOO—

benzoyl

cyclopentyl

EtOCOO—

benzoyl

phenyl

EtOCOO—

2-FuCO—

2-furyl

EtOCOO—

2-FuCO—

3-furyl

EtOCOO—

2-FuCO—

3-thienyl

EtOCOO—

2-FuCO—

2-pyridyl

EtOCOO—

2-FuCO—

3-pyridyl

EtOCOO—

2-FuCO—

4-pyridyl

EtOCOO—

2-FuCO—

isobutenyl

EtOCOO—

2-FuCO—

isopropyl

EtOCOO—

2-FuCO—

cyclopropyl

EtOCOO—

2-FuCO—

cyclobutyl

EtOCOO—

2-FuCO—

cyclopentyl

EtOCOO—

2-FuCO—

phenyl

EtOCOO—

2-ThCO—

2-furyl

EtOCOO—

2-ThCO—

3-furyl

EtOCOO—

2-ThCO—

3-thienyl

EtOCOO—

2-ThCO—

2-pyridyl

EtOCOO—

2-ThCO—

3-pyridyl

EtOCOO—

2-ThCO—

4-pyridyl

EtOCOO—

2-ThCO—

isobutenyl

EtOCOO—

2-ThCO—

isopropyl

EtOCOO—

2-ThCO—

cyclopropyl

EtOCOO—

2-ThCO—

cyclobutyl

EtOCOO—

2-ThCO—

cyclopentyl

EtOCOO—

2-ThCO—

phenyl

EtOCOO—

2-PyCO—

2-furyl

EtOCOO—

2-PyCO—

3-furyl

EtOCOO—

2-PyCO—

2-thienyl

EtOCOO—

2-PyCO—

3-thienyl

EtOCOO—

2-PyCO—

2-pyridyl

EtOCOO—

2-PyCO—

3-pyridyl

EtOCOO—

2-PyCO—

4-pyridyl

EtOCOO—

2-PyCO—

isobutenyl

EtOCOO—

2-PyCO—

isopropyl

EtOCOO—

2-PyCO—

cyclopropyl

EtOCOO—

2-PyCO—

cyclobutyl

EtOCOO—

2-PyCO—

cyclopentyl

EtOCOO—

2-PyCO—

phenyl

EtOCOO—

3-PyCO—

2-furyl

EtOCOO—

3-PyCO—

3-furyl

EtOCOO—

3-PyCO—

2-thienyl

EtOCOO—

3-PyCO—

3-thienyl

EtOCOO—

3-PyCO—

2-pyridyl

EtOCOO—

3-PyCO—

3-pyridyl

EtOCOO—

3-PyCO—

4-pyridyl

EtOCOO—

3-PyCO—

isobutenyl

EtOCOO—

3-PyCO—

isopropyl

EtOCOO—

3-PyCO—

cyclopropyl

EtOCOO—

3-PyCO—

cyclobutyl

EtOCOO—

3-PyCO—

cyclopentyl

EtOCOO—

3-PyCO—

phenyl

EtOCOO—

4-PyCO—

2-furyl

EtOCOO—

4-PyCO—

3-furyl

EtOCOO—

4-PyCO—

2-thienyl

EtOCOO—

4-PyCO—

3-thienyl

EtOCOO—

4-PyCO—

2-pyridyl

EtOCOO—

4-PyCO—

3-pyridyl

EtOCOO—

4-PyCO—

4-pyridyl

EtOCOO—

4-PyCO—

isobutenyl

EtOCOO—

4-PyCO—

isopropyl

EtOCOO—

4-PyCO—

cyclopropyl

EtOCOO—

4-PyCO—

cyclobutyl

EtOCOO—

4-PyCO—

cyclopentyl

EtOCOO—

4-PyCO—

phenyl

EtOCOO—

C4H7CO—

2-furyl

EtOCOO—

C4H7CO—

3-furyl

EtOCOO—

C4H7CO—

2-thienyl

EtOCOO—

C4H7CO—

3-thienyl

EtOCOO—

C4H7CO—

2-pyridyl

EtOCOO—

C4H7CO—

3-pyridyl

EtOCOO—

C4H7CO—

4-pyridyl

EtOCOO—

C4H7CO—

isobutenyl

EtOCOO—

C4H7CO—

isopropyl

EtOCOO—

C4H7CO—

cyclopropyl

EtOCOO—

C4H7CO—

cyclobutyl

EtOCOO—

C4H7CO—

cyclopentyl

EtOCOO—

C4H7CO—

phenyl

EtOCOO—

EtOCO—

2-furyl

EtOCOO—

EtOCO—

3-furyl

EtOCOO—

EtOCO—

2-thienyl

EtOCOO—

EtOCO—

3-thienyl

EtOCOO—

EtOCO—

2-pyridyl

EtOCOO—

EtOCO—

3-pyridyl

EtOCOO—

EtOCO—

4-pyridyl

EtOCOO—

EtOCO—

isobutenyl

EtOCOO—

EtOCO—

isopropyl

EtOCOO—

EtOCO—

cyclopropyl

EtOCOO—

EtOCO—

cyclobutyl

EtOCOO—

EtOCO—

cyclopentyl

EtOCOO—

EtOCO—

phenyl

EtOCOO—

ibueCO—

3-furyl

EtOCOO—

ibueCO—

3-thienyl

EtOCOO—

ibueCO—

2-pyridyl

EtOCOO—

ibueCO—

3-pyridyl

EtOCOO—

ibueCO—

4-pyridyl

EtOCOO—

ibueCO—

isobutenyl

EtOCOO—

ibueCO—

isopropyl

EtOCOO—

ibueCO—

cyclopropyl

EtOCOO—

ibueCO—

cyclobutyl

EtOCOO—

ibueCO—

cyclopentyl

EtOCOO—

ibueCO—

phenyl

EtOCOO—

iBuCO—

2-furyl

EtOCOO—

iBuCO—

3-furyl

EtOCOO—

iBuCO—

2-thienyl

EtOCOO—

iBuCO—

3-thienyl

EtOCOO—

iBuCO—

2-pyridyl

EtOCOO—

iBuCO—

3-pyridyl

EtOCOO—

iBuCO—

4-pyridyl

EtOCOO—

iBuCO—

isobutenyl

EtOCOO—

iBuCO—

isopropyl

EtOCOO—

iBuCO—

cyclopropyl

EtOCOO—

iBuCO—

cyclobutyl

EtOCOO—

iBuCO—

cyclopentyl

EtOCOO—

iBuCO—

phenyl

EtOCOO—

iBuOCO—

3-furyl

EtOCOO—

iBuOCO—

2-pyridyl

EtOCOO—

iBuOCO—

3-pyridyl

EtOCOO—

iBuOCO—

4-pyridyl

EtOCOO—

iBuOCO—

isopropyl

EtOCOO—

iBuOCO—

cyclopropyl

EtOCOO—

iBuOCO—

cyclobutyl

EtOCOO—

iBuOCO—

cyclopentyl

EtOCOO—

iBuOCO—

phenyl

EtOCOO—

iPrOCO—

2-furyl

EtOCOO—

iPrOCO—

3-furyl

EtOCOO—

iPrOCO—

3-thienyl

EtOCOO—

iPrOCO—

2-pyridyl

EtOCOO—

iPrOCO—

3-pyridyl

EtOCOO—

iPrOCO—

4-pyridyl

EtOCOO—

iPrOCO—

isobutenyl

EtOCOO—

iPrOCO—

isopropyl

EtOCOO—

iPrOCO—

cyclopropyl

EtOCOO—

iPrOCO—

cyclobutyl

EtOCOO—

iPrOCO—

cyclopentyl

EtOCOO—

iPrOCO—

phenyl

EtOCOO—

nPrOCO—

2-furyl

EtOCOO—

nPrOCO—

3-furyl

EtOCOO—

nPrOCO—

2-thienyl

EtOCOO—

nPrOCO—

3-thienyl

EtOCOO—

nPrOCO—

2-pyridyl

EtOCOO—

nPrOCO—

3-pyridyl

EtOCOO—

nPrOCO—

4-pyridyl

EtOCOO—

nPrOCO—

isobutenyl

EtOCOO—

nPrOCO—

isopropyl

EtOCOO—

nPrOCO—

cyclopropyl

EtOCOO—

nPrOCO—

cyclobutyl

EtOCOO—

nPrOCO—

cyclopentyl

EtOCOO—

nPrOCO—

phenyl

EtOCOO—

nPrCO—

2-furyl

EtOCOO—

nPrCO—

3-furyl

EtOCOO—

nPrCO—

2-thienyl

EtOCOO—

nPrCO—

3-thienyl

EtOCOO—

nPrCO—

2-pyridyl

EtOCOO—

nPrCO—

3-pyridyl

EtOCOO—

nPrCO—

4-pyridyl

EtOCOO—

nPrCO—

isobutenyl

EtOCOO—

nPrCO—

isopropyl

EtOCOO—

nPrCO—

cyclopropyl

EtOCOO—

nPrCO—

cyclobutyl

EtOCOO—

nPrCO—

cyclopentyl

EtOCOO—

nPrCO—

phenyl

EtOCOO—

tBuOCO—

2-pyridyl

MeOCOO—

tBuOCO—

3-pyridyl

MeOCOO—

tBuOCO—

4-pyridyl

MeOCOO—

tBuOCO—

isopropyl

MeOCOO—

tBuOCO—

cyclobutyl

MeOCOO—

tBuOCO—

cyclopentyl

MeOCOO—

tBuOCO—

phenyl

MeOCOO—

benzoyl

2-furyl

MeOCOO—

benzoyl

3-furyl

MeOCOO—

benzoyl

3-thienyl

MeOCOO—

benzoyl

2-pyridyl

MeOCOO—

benzoyl

3-pyridyl

MeOCOO—

benzoyl

4-pyridyl

MeOCOO—

benzoyl

isobutenyl

MeOCOO—

benzoyl

isopropyl

MeOCOO—

benzoyl

cyclopropyl

MeOCOO—

benzoyl

cyclobutyl

MeOCOO—

benzoyl

cyclopentyl

MeOCOO—

benzoyl

phenyl

MeOCOO—

2-FuCO—

2-furyl

MeOCOO—

2-FuCO—

3-furyl

MeOCOO—

2-FuCO—

3-thienyl

MeOCOO—

2-FuCO—

2-pyridyl

MeOCOO—

2-FuCO—

3-pyridyl

MeOCOO—

2-FuCO—

4-pyridyl

MeOCOO—

2-FuCO—

isobutenyl

MeOCOO—

2-FuCO—

isopropyl

MeOCOO—

2-FuCO—

cyclopropyl

MeOCOO—

2-FuCO—

cyclobutyl

MeOCOO—

2-FuCO—

cyclopentyl

MeOCOO—

2-FuCO—

phenyl

MeOCOO—

2-ThCO—

2-furyl

MeOCOO—

2-ThCO—

3-furyl

MeOCOO—

2-ThCO—

3-thienyl

MeOCOO—

2-ThCO—

2-pyridyl

MeOCOO—

2-ThCO—

3-pyridyl

MeOCOO—

2-ThCO—

4-pyridyl

MeOCOO—

2-ThCO—

isobutenyl

MeOCOO—

2-ThCO—

isopropyl

MeOCOO—

2-ThCO—

cyclopropyl

MeOCOO—

2-ThCO—

cyctobutyl

MeOCOO—

2-ThCO—

cyclopentyl

MeOCOO—

2-ThCO—

phenyl

MeOCOO—

2-PyCO—

2-furyl

MeOCOO—

2-PyCO—

3-furyl

MeOCOO—

2-PyCO—

2-thienyl

MeOCOO—

2-PyCO—

3-thienyl

MeOCOO—

2-PyCO—

2-pyridyl

MeOCOO—

2-PyCO—

3-pyridyl

MeOCOO—

2-PyCO—

4-pyridyl

MeOCOO—

2-PyCO—

isobutenyl

MeOCOO—

2-PyCO—

isopropyl

MeOCOO—

2-PyCO—

cyclopropyl

MeOCOO—

2-PyCO—

cyclobutyl

MeOCOO—

2-PyCO—

cyclopentyl

MeOCOO—

2-PyCO—

phenyl

MeOCOO—

3-PyCO—

2-furyl

MeOCOO—

3-PyCO—

3-furyl

MeOCOO—

3-PyCO—

2-thienyl

MeOCOO—

3-PyCO—

3-thienyl

MeOCOO—

3-PyCO—

2-pyridyl

MeOCOO—

3-PyCO—

3-pyridyl

MeOCOO—

3-PyCO—

4-pyridyl

MeOCOO—

3-PyCO—

isobutenyl

MeOCOO—

3-PyCO—

isopropyl

MeOCOO—

3-PyCO—

cyclopropyl

MeOCOO—

3-PyCO—

cyclobutyl

MeOCOO—

3-PyCO—

cyclopentyl

MeOCOO—

3-PyCO—

phenyl

MeOCOO—

4-PyCO—

2-furyl

MeOCOO—

4-PyCO—

3-furyl

MeOCOO—

4-PyCO—

2-thienyl

MeOCOO—

4-PyCO—

3-thienyl

MeOCOO—

4-PyCO—

2-pyridyl

MeOCOO—

4-PyCO—

3-pyridyl

MeOCOO—

4-PyCO—

4-pyridyl

MeOCOO—

4-PyCO—

isobutenyl

MeOCOO—

4-PyCO—

isopropyl

MeOCOO—

4-PyCO—

cyclopropyl

MeOCOO—

4-PyCO—

cyclobutyl

MeOCOO—

4-PyCO—

cyclopentyl

MeOCOO—

4-PyCO—

phenyl

MeOCOO—

C4H7CO—

2-furyl

MeOCOO—

C4H7CO—

3-furyl

MeOCOO—

C4H7CO—

2-thienyl

MeOCOO—

C4H7CO—

3-thienyl

MeOCOO—

C4H7CO—

2-pyridyl

MeOCOO—

C4H7CO—

3-pyridyl

MeOCOO—

C4H7CO—

4-pyridyl

MeOCOO—

C4H7CO—

isobutenyl

MeOCOO—

C4H7CO—

isopropyl

MeOCOO—

C4H7CO—

cyclopropyl

MeOCOO—

C4H7CO—

cyclobutyl

MeOCOO—

C4H7CO—

cyclopentyl

MeOCOO—

C4H7CO—

phenyl

MeOCOO—

EtOCO—

2-furyl

MeOCOO—

EtOCO—

3-furyl

MeOCOO—

EtOCO—

2-thienyl

MeOCOO—

EtOCO—

3-thienyl

MeOCOO—

EtOCO—

2-pyridyl

MeOCOO—

EtOCO—

3-pyridyl

MeOCOO—

EtOCO—

4-pyridyl

MeOCOO—

EtOCO—

isobutenyl

MeOCOO—

EtOCO—

isopropyl

MeOCOO—

EtOCO—

cyclopropyl

MeOCOO—

EtOCO—

cyclobutyl

MeOCOO—

EtOCO—

cyclopentyl

MeOCOO—

EtOCO—

phenyl

MeOCOO—

ibueCO—

2-furyl

MeOCOO—

ibueCO—

3-furyl

MeOCOO—

ibueCO—

3-thienyl

MeOCOO—

ibueCO—

2-pyridyl

MeOCOO—

ibueCO—

3-pyridyl

MeOCOO—

ibueCO—

4-pyridyl

MeOCOO—

ibueCO—

isobutenyl

MeOCOO—

ibueCO—

isopropyl

MeOCOO—

ibueCO—

cyclopropyl

MeOCOO—

ibueCO—

cyclobutyl

MeOCOO—

ibueCO—

cyclopentyl

MeOCOO—

ibueCO—

phenyl

MeOCOO—

iBuCO—

2-furyl

MeOCOO—

iBuCO—

3-furyl

MeOCOO—

iBuCO—

2-thienyl

MeOCOO—

iBuCO—

3-thienyl

MeOCOO—

iBuCO—

2-pyridyl

MeOCOO—

iBuCO—

3-pyridyl

MeOCOO—

iBuCO—

4-pyridyl

MeOCOO—

iBuCO—

isobutenyl

MeOCOO—

iBuCO—

isopropyl

MeOCOO—

iBuCO—

cyclopropyl

MeOCOO—

iBuCO—

cyclobutyl

MeOCOO—

iBuCO—

cyclopentyl

MeOCOO—

iBuCO—

phenyl

MeOCOO—

iBuOCO—

2-pyridyl

MeOCOO—

iBuOCO—

3-pyridyl

MeOCOO—

iBuOCO—

4-pyridyl

MeOCOO—

iBuOCO—

isopropyl

MeOCOO—

iBuOCO—

cyclopropyl

MeOCOO—

iBuOCO—

cyclobutyl

MeOCOO—

iBuOCO—

cyclopentyl

MeOCOO—

iBuOCO—

phenyl

MeOCOO—

iPrOCO—

2-furyl

MeOCOO—

iPrOCO—

3-furyl

MeOCOO—

iPrOCO—

3-thienyl

MeOCOO—

iPrOCO—

2-pyridyl

MeOCOO—

iPrOCO—

3-pyridyl

MeOCOO—

iPrOCO—

4-pyridyl

MeOCOO—

iPrOCO—

isobutenyl

MeOCOO—

iPrOCO—

isopropyl

MeOCOO—

iPrOCO—

cyclopropyl

MeOCOO—

iPrOCO—

cyclobutyl

MeOCOO—

iPrOCO—

cyclopentyl

MeOCOO—

iPrOCO—

phenyl

MeOCOO—

nPrOCO—

2-furyl

MeOCOO—

nPrOCO—

3-furyl

MeOCOO—

nPrOCO—

2-thienyl

MeOCOO—

nPrOCO—

3-thienyl

MeOCOO—

nPrOCO—

2-pyridyl

MeOCOO—

nPrOCO—

3-pyridyl

MeOCOO—

nPrOCO—

4-pyridyl

MeOCOO—

nPrOCO—

isobutenyl

MeOCOO—

nPrOCO—

isopropyl

MeOCOO—

nPrOCO—

cyclopropyl

MeOCOO—

nPrOCO—

cyclobutyl

MeOCOO—

nPrOCO—

cyclopentyl

MeOCOO—

nPrOCO—

phenyl

MeOCOO—

nPrCO—

2-furyl

MeOCOO—

nPrCO—

3-furyl

MeOCOO—

nPrCO—

2-thienyl

MeOCOO—

nPrCO—

3-thienyl

MeOCOO—

nPrCO—

2-pyridyl

MeOCOO—

nPrCO—

3-pyridyl

MeOCOO—

nPrCO—

4-pyridyl

MeOCOO—

nPrCO—

isobutenyl

MeOCOO—

nPrCO—

isopropyl

MeOCOO—

nPrCO—

cyclopropyl

MeOCOO—

nPrCO—

cyclobutyl

MeOCOO—

nPrCO—

cyclopentyl

MeOCOO—

nPrCO—

phenyl

MeOCOO—

EXAMPLE 4

Following the processes described in Example 1 and elsewhere herein, the following specific taxanes having structural formula 15 may be prepared, wherein in each of the series (that is, each of series “A” through “K”) R10 is hydroxy and R7 is as previously defined, including wherein R7 is R7aOCOO— and R7a is (i) substituted or unsubstituted, preferably unsubstituted, C2 to C8 alkyl (straight, branched or cyclic), such as ethyl, propyl, butyl, pentyl, or hexyl; (ii) substituted or unsubstituted, preferably unsubstituted, C2 to C8 alkenyl (straight, branched or cyclic), such as ethenyl, propenyl, butenyl, pentenyl or hexenyl; (iii) substituted or unsubstituted, preferably unsubstituted, C2 to C8 alkynyl (straight or branched) such as ethynyl, propynyl, butynyl, pentynyl, or hexynyl; (iv) substituted or unsubstituted, preferably unsubstituted, phenyl; or (v) substituted or unsubstituted, preferably unsubstituted, heteroaromatic such as furyl, thienyl, or pyridyl.

In the “A” series of compounds, X10 is as otherwise as defined herein. Preferably, heterocyclo is substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), and R7 and R10 each have the beta stereochemical configuration.

In the “B” series of compounds, X10 and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7 and R10 each have the beta stereochemical configuration.

In the “C” series of compounds, X10 and R9a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R9a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R10 each have the beta stereochemical configuration.

In the “D” and “E” series of compounds, X10 is as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), and R7, R9 (series D only) and R10 each have the beta stereochemical configuration.

In the “F” series of compounds, X10, R2a and R9a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R10 each have the beta stereochemical configuration.

In the “G” series of compounds, X10 and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R10 each have the beta stereochemical configuration.

In the “H” series of compounds, X10 is as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7 and R10 each have the beta stereochemical configuration.

In the “I” series of compounds, X10 and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7 and R10 each have the beta stereochemical configuration.

In the “J” series of compounds, X10 and R2a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R10 each have the beta stereochemical configuration.

In the “K” series of compounds, X10, R2a and R9a are as otherwise as defined herein. Preferably, heterocyclo is preferably substituted or unsubstitued furyl, thienyl, or pyridyl, X10 is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl (e.g., tert-butyl), R2a is preferably substituted or unsubstitued furyl, thienyl, pyridyl, phenyl, or lower alkyl, and R7, R9 and R10 each have the beta stereochemical configuration.

Any substituents of each X3, X5, R2, R7, and R9 may be hydrocarbyl or any of the heteroatom containing substituents selected from the group consisting of heterocyclo, alkoxy, alkenoxy, alkynoxy, aryloxy, hydroxy, protected hydroxy, keto, acyloxy, nitro, amino, amido, thiol, ketal, acetal, ester and ether moieties, but not phosphorous containing moieties.

Four hundred cells (HCT116) were plated in 60 mm Petri dishes containing 2.7 mL of medium (modified McCoy's 5a medium containing 10% fetal bovine serum and 100 units/mL penicillin and 100 g/mL streptomycin). The cells were incubated in a CO2 incubator at 37° C. for 5 h for attachment to the bottom of Petri dishes. The compounds identified in Example 2 were made up fresh in medium at ten times the final concentration, and then 0.3 mL of this stock solution was added to the 2.7 mL of medium in the dish. The cells were then incubated with drugs for 72 h at 37° C. At the end of incubation the drug-containing media were decanted, the dishes were rinsed with 4 mL of Hank's Balance Salt Solution (HBSS), 5 mL of fresh medium was added, and the dishes were returned to the incubator for colony formation. The cell colonies were counted using a colony counter after incubation for 7 days. Cell survival was calculated and the values of ID50 (the drug concentration producing 50% inhibition of colony formation) were determined for each tested compound.

Enzymatic hydrolysis methods for the preparation of C-10 and C-13 hydroxyl-bearing taxanes, enzymatic esterification method for the preparation of C-10 acyloxy-bearing taxanes, and use thereof in the preparation of C-13 acyloxy-bearing taxanes